SSE SSE2 and SSE3 for GNU C++

Question

Is there a simple tutorial for me to get up to speed in SSE, SSE2 and SSE3 in GNU C++? How can you do code optimization in SSE?

Answer 1

MSDN has pretty good description of SSE compiler built-ins (and those built-ins are de-facto standard, they even work in clang/XCode).

• http://msdn.microsoft.com/en-us/library/26td21ds.aspx
• http://msdn.microsoft.com/en-us/library/kcwz153a.aspx

The nice thing about that reference is that it shows equivalent pseudocode, so e.g. you can learn that ADDPD instruction is:

r0 := a0 + b0
r1 := a1 + b1

And here's good description of a cryptic shuffle instruction: http://www.songho.ca/misc/sse/sse.html